From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: GC and stack marking Date: Wed, 21 May 2014 05:48:08 +0300 Message-ID: <83ppj7oniv.fsf@gnu.org> References: <83a9add91p.fsf@gnu.org> <8338g4bd7m.fsf@gnu.org> <83wqdgntan.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1400640504 15272 80.91.229.3 (21 May 2014 02:48:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 21 May 2014 02:48:24 +0000 (UTC) Cc: fabrice.popineau@gmail.com, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed May 21 04:48:15 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WmwZi-0006lU-9p for ged-emacs-devel@m.gmane.org; Wed, 21 May 2014 04:48:14 +0200 Original-Received: from localhost ([::1]:56457 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmwZh-0002mi-Db for ged-emacs-devel@m.gmane.org; Tue, 20 May 2014 22:48:13 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:54643) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmwZa-0002ld-RB for emacs-devel@gnu.org; Tue, 20 May 2014 22:48:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WmwZV-0007zV-Kw for emacs-devel@gnu.org; Tue, 20 May 2014 22:48:06 -0400 Original-Received: from mtaout27.012.net.il ([80.179.55.183]:50846) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmwZV-0007zL-CO for emacs-devel@gnu.org; Tue, 20 May 2014 22:48:01 -0400 Original-Received: from conversion-daemon.mtaout27.012.net.il by mtaout27.012.net.il (HyperSendmail v2007.08) id <0N5W00N00KCYOU00@mtaout27.012.net.il> for emacs-devel@gnu.org; Wed, 21 May 2014 05:44:44 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout27.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N5W00IC4KYK4280@mtaout27.012.net.il>; Wed, 21 May 2014 05:44:44 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 80.179.55.183 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:171975 Archived-At: > From: Stefan Monnier > Cc: emacs-devel@gnu.org, fabrice.popineau@gmail.com > Date: Tue, 20 May 2014 18:01:05 -0400 > > > I tried, but couldn't. Suggestions for how to set up a GDB session > > for that are welcome. > > I guess you could try the following: > - interrupt the dump just before setting purify-flag to nil. > - get the value of purify-flag. > - set a conditional break point in mark_object that catches the case > where the argument is equal to the value you just got. > - "c" That's how I found out that it was being marked by mark_stack. But that doesn't tell you how that value _got_ on the stack, does it?